CalcEngine: Remove the need to specify base/radix when working with Rational values (#31)

- Separates values from the representation (base/radix) of those values.
- Uses a single base for all values represented as Rationals.
- Rationals are converted to/from a specific base when they are converted to/from strings.

src/CalcManager/Ratpack/conv.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 //---------------------------------------------------------------------------
@@ -347,6 +347,7 @@ PNUMBER numtonRadixx(_In_ PNUMBER a, uint32_t radix)
 //              mantissa a string representation of a number
 //              exponentIsNegative  true if exponent is less than zero
 //              exponent a string representation of a number
+//              radix is the number base used in the source string
 //
 //  RETURN: PRAT representation of string input.
 //          Or nullptr if no number scanned.

src/CalcManager/Ratpack/rat.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 //-----------------------------------------------------------------------------

src/CalcManager/Ratpack/support.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 //----------------------------------------------------------------------------